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| author | Matthias Kretz <m.kretz@gsi.de> | 2021-06-30 10:41:33 +0200 |
|---|---|---|
| committer | Matthias Kretz <m.kretz@gsi.de> | 2021-09-20 15:13:11 +0200 |
| commit | 1949d7540a0322993bcae2f8893e2dbd29209040 (patch) | |
| tree | d0c88b42ad3ae57574993673ea95ff691b2f4ecf /gcc/doc/cpp.texi | |
| parent | 71a4bdada59d2d6d1f17c949eaf9377ebb7a8854 (diff) | |
| download | gcc-1949d7540a0322993bcae2f8893e2dbd29209040.zip gcc-1949d7540a0322993bcae2f8893e2dbd29209040.tar.gz gcc-1949d7540a0322993bcae2f8893e2dbd29209040.tar.bz2 | |
c-family: Add more predefined macros for math flags
Library code, especially in headers, sometimes needs to know how the
compiler interprets / optimizes floating-point types and operations.
This information can be used for additional optimizations or for
ensuring correctness. This change makes -freciprocal-math,
-fno-signed-zeros, -fno-trapping-math, -fassociative-math, and
-frounding-math report their state via corresponding pre-defined macros.
Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
gcc/testsuite/ChangeLog:
* gcc.dg/associative-math-1.c: New test.
* gcc.dg/associative-math-2.c: New test.
* gcc.dg/no-signed-zeros-1.c: New test.
* gcc.dg/no-signed-zeros-2.c: New test.
* gcc.dg/no-trapping-math-1.c: New test.
* gcc.dg/no-trapping-math-2.c: New test.
* gcc.dg/reciprocal-math-1.c: New test.
* gcc.dg/reciprocal-math-2.c: New test.
* gcc.dg/rounding-math-1.c: New test.
* gcc.dg/rounding-math-2.c: New test.
gcc/c-family/ChangeLog:
* c-cppbuiltin.c (c_cpp_builtins_optimize_pragma): Define or
undefine __RECIPROCAL_MATH__, __NO_SIGNED_ZEROS__,
__NO_TRAPPING_MATH__, __ASSOCIATIVE_MATH__, and
__ROUNDING_MATH__ according to the new optimization flags.
gcc/ChangeLog:
* cppbuiltin.c (define_builtin_macros_for_compilation_flags):
Define __RECIPROCAL_MATH__, __NO_SIGNED_ZEROS__,
__NO_TRAPPING_MATH__, __ASSOCIATIVE_MATH__, and
__ROUNDING_MATH__ according to their corresponding flags.
* doc/cpp.texi: Document __RECIPROCAL_MATH__,
__NO_SIGNED_ZEROS__, __NO_TRAPPING_MATH__, __ASSOCIATIVE_MATH__,
and __ROUNDING_MATH__.
Diffstat (limited to 'gcc/doc/cpp.texi')
| -rw-r--r-- | gcc/doc/cpp.texi | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi index d4b3ff0..53f7204 100644 --- a/gcc/doc/cpp.texi +++ b/gcc/doc/cpp.texi @@ -2462,6 +2462,24 @@ features are supported by GCC. This macro is defined if @option{-fno-math-errno} is used, or enabled by another option such as @option{-ffast-math} or by default. +@item __RECIPROCAL_MATH__ +This macro is defined if @option{-freciprocal-math} is used, or enabled +by another option such as @option{-ffast-math} or by default. + +@item __NO_SIGNED_ZEROS__ +This macro is defined if @option{-fno-signed-zeros} is used, or enabled +by another option such as @option{-ffast-math} or by default. + +@item __NO_TRAPPING_MATH__ +This macro is defined if @option{-fno-trapping-math} is used. + +@item __ASSOCIATIVE_MATH__ +This macro is defined if @option{-fassociative-math} is used, or enabled +by another option such as @option{-ffast-math} or by default. + +@item __ROUNDING_MATH__ +This macro is defined if @option{-frounding-math} is used. + @item __GNUC_EXECUTION_CHARSET_NAME @itemx __GNUC_WIDE_EXECUTION_CHARSET_NAME These macros are defined to expand to a narrow string literal of |